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Old 09-20-2017, 12:26 PM
oddshooter oddshooter is offline
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I have had the same problem.

You may be reducing the diameter of every bullet you seat. I don't care what size it is.

Seating dies can all swage down the diameter when it pushes the lead boolit into the case. You spend time and money getting a correct size boolit only to shrink it during seating. Bad.

The answer is to get the M style cowboy dies from RCBS or Redding. Then call for a new stem sized correctly to .431. They will do it for free.

The M style creates a "nest" that will accept the boolit without swaging it down.


Prescut
Also, large rifle primers may not be helping the unburnt granules. Back off the powder a little and try using large pistol magnums. That will help. Slow powders like H110, 296, 4227 absolutely demand it.
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